In a random survey, 22 adults in the U.S. were asked how much they spent on their child's last birthday gift. The result

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In A Random Survey 22 Adults In The U S Were Asked How Much They Spent On Their Child S Last Birthday Gift The Result 1 (88.18 KiB) Viewed 75 times

In a random survey, 22 adults in the U.S. were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped, verified with a normality plot, with a mean of $49 and standard deviation of $4. Find the 90% confidence interval. To form a confidence interval check that the conditions were satisfied. (1) Was this a randomized experiment or random sample? O no Oyes (2) Are the observations independent? Check with n ≤ 0.05N. <0.05 N What does this tell us the required population size is? Round to 1 decimal place, if needed. N> Note: There are about 210,000,000 adults in the U.S. This means that The observations are independent because the sample size is less than 5% of the population size, i.e. n < 0.05 N The observations are NOT independent because the sample size is NOT less than 5% of the population size, i.e. n > 0.05 N O It is impossible to tell whether the observations are independent or dependent with the given information. (3) Is the sample size large enough? OYes, because the population is likely normal because of the normality plot verification on the sample. O It is unknown whether the sample is large enough given the information. OYes, because n ≥ 30. O No, the sample n is not greater than or equal to 30. Are the conditions for a Confidence Interval satisfied? (i.e. Can you perform a T-Estimate of a mean?) O no yes